Infoblox - Many NXDOMAIN DNS Responses Detected
Id | b2f34315-9065-488e-88d0-a171d2b0da8e |
Rulename | Infoblox - Many NXDOMAIN DNS Responses Detected |
Description | Detected at least 200 DNS responses for non-existent domains in 1 hour generated by single host. Queries do not need to be the same. Customize query count, scheduling, responses and more. This rule depends on a parser based on a Kusto Function to work as expected called **InfobloxCDC**. |
Severity | Medium |
Tactics | Impact |
Techniques | T1498 T1565 |
Required data connectors | CefAma InfobloxCloudDataConnector InfobloxCloudDataConnectorAma |
Kind | Scheduled |
Query frequency | 1h |
Query period | 1h |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Infoblox Cloud Data Connector/Analytic Rules/Infoblox-ManyNXDOMAINDNSResponsesDetected.yaml |
Version | 1.0.2 |
Arm template | b2f34315-9065-488e-88d0-a171d2b0da8e.json |
let threshold = 200;
InfobloxCDC
| where DeviceEventClassID == "DNS Response"
| where InfobloxDNSRCode == "NXDOMAIN"
| summarize count() by SourceIP
| where count_ > threshold
| join kind=inner (InfobloxCDC
| where DeviceEventClassID == "DNS Response"
| where InfobloxDNSRCode == "NXDOMAIN"
) on SourceIP
name: Infoblox - Many NXDOMAIN DNS Responses Detected
version: 1.0.2
severity: Medium
queryFrequency: 1h
triggerOperator: gt
customDetails:
SourceMACAddress: SourceMACAddress
relevantTechniques:
- T1498
- T1565
status: Available
description: |
'Detected at least 200 DNS responses for non-existent domains in 1 hour generated by single host. Queries do not need to be the same. Customize query count, scheduling, responses and more. This rule depends on a parser based on a Kusto Function to work as expected called [**InfobloxCDC**](https://aka.ms/sentinel-InfobloxCloudDataConnector-parser).'
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Infoblox Cloud Data Connector/Analytic Rules/Infoblox-ManyNXDOMAINDNSResponsesDetected.yaml
requiredDataConnectors:
- connectorId: InfobloxCloudDataConnector
dataTypes:
- CommonSecurityLog (InfobloxCDC)
- connectorId: InfobloxCloudDataConnectorAma
dataTypes:
- CommonSecurityLog (InfobloxCDC)
- connectorId: CefAma
dataTypes:
- CommonSecurityLog
entityMappings:
- fieldMappings:
- identifier: Address
columnName: SourceIP
entityType: IP
- fieldMappings:
- identifier: HostName
columnName: DeviceName
- identifier: OSVersion
columnName: InfobloxB1SrcOSVersion
- identifier: FullName
columnName: SourceUserName
entityType: Host
tactics:
- Impact
queryPeriod: 1h
query: |
let threshold = 200;
InfobloxCDC
| where DeviceEventClassID == "DNS Response"
| where InfobloxDNSRCode == "NXDOMAIN"
| summarize count() by SourceIP
| where count_ > threshold
| join kind=inner (InfobloxCDC
| where DeviceEventClassID == "DNS Response"
| where InfobloxDNSRCode == "NXDOMAIN"
) on SourceIP
incidentConfiguration:
createIncident: true
kind: Scheduled
eventGroupingSettings:
aggregationKind: SingleAlert
triggerThreshold: 0
id: b2f34315-9065-488e-88d0-a171d2b0da8e
{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
"workspace": {
"type": "String"
}
},
"resources": [
{
"apiVersion": "2024-01-01-preview",
"id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/b2f34315-9065-488e-88d0-a171d2b0da8e')]",
"kind": "Scheduled",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b2f34315-9065-488e-88d0-a171d2b0da8e')]",
"properties": {
"alertRuleTemplateName": "b2f34315-9065-488e-88d0-a171d2b0da8e",
"customDetails": {
"SourceMACAddress": "SourceMACAddress"
},
"description": "'Detected at least 200 DNS responses for non-existent domains in 1 hour generated by single host. Queries do not need to be the same. Customize query count, scheduling, responses and more. This rule depends on a parser based on a Kusto Function to work as expected called [**InfobloxCDC**](https://aka.ms/sentinel-InfobloxCloudDataConnector-parser).'\n",
"displayName": "Infoblox - Many NXDOMAIN DNS Responses Detected",
"enabled": true,
"entityMappings": [
{
"entityType": "IP",
"fieldMappings": [
{
"columnName": "SourceIP",
"identifier": "Address"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"columnName": "DeviceName",
"identifier": "HostName"
},
{
"columnName": "InfobloxB1SrcOSVersion",
"identifier": "OSVersion"
},
{
"columnName": "SourceUserName",
"identifier": "FullName"
}
]
}
],
"eventGroupingSettings": {
"aggregationKind": "SingleAlert"
},
"incidentConfiguration": {
"createIncident": true
},
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Infoblox Cloud Data Connector/Analytic Rules/Infoblox-ManyNXDOMAINDNSResponsesDetected.yaml",
"query": "let threshold = 200;\nInfobloxCDC\n| where DeviceEventClassID == \"DNS Response\"\n| where InfobloxDNSRCode == \"NXDOMAIN\"\n| summarize count() by SourceIP\n| where count_ > threshold\n| join kind=inner (InfobloxCDC\n | where DeviceEventClassID == \"DNS Response\"\n | where InfobloxDNSRCode == \"NXDOMAIN\"\n ) on SourceIP\n",
"queryFrequency": "PT1H",
"queryPeriod": "PT1H",
"severity": "Medium",
"status": "Available",
"subTechniques": [],
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Impact"
],
"techniques": [
"T1498",
"T1565"
],
"templateVersion": "1.0.2",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0
},
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
}
]
}